Senior AI/ML Software Engineer

🌍 Remote, USA 🎯 Full-time 🕐 Posted Recently

Job Description

It's fun to work in a company where people truly BELIEVE in what they're doing!

Fullsteam is a leading provider of vertical software and embedded payments technology dedicated to helping businesses flourish by providing their customers with seamless experiences. With a dynamic and growing team of over 1,900 employees, we are committed to driving innovation and delivering best-in-class software and payment solutions that empower small and medium-sized businesses across numerous industries. Our purpose is to help our customers grow their businesses and delight their customers. Join us and be a part of a forward-thinking company that values growth, excellence, and the success of our clients.

We are seeking a talented and experienced Senior AI Software Engineer specializing in Artificial Intelligence to lead the development and integration of advanced AI solutions into our products. As a Lead Engineer, you will be responsible for designing and implementing high-quality, scalable AI. Models and collaborating with cross-functional teams to push the boundaries of AI in software development. Your work will focus on building cutting-edge applications leveraging Machine Learning (ML), Natural Language Processing (NLP) and Generative AI to deliver exceptional experiences and solutions to our users.

Primary Responsibilities:

Build production software – Design and implement scalable backend services, APIs, and data pipelines with a focus on reliability, performance, and maintainability
Develop agentic systems – Create autonomous agents that leverage LLMs to reason, use tools, and orchestrate complex multi-step workflows
Architect for scale – Design systems that handle real-time AI inference, converation state, and tool execution with proper error handling and recovery
Design, develop, and deploy machine learning models that drive product features, improve user engagement, and enhance decision-making processes
Collaborate cross-functionally – Partner with Product, Design, and Engineering teams to define requirements and deliver AI-powered features.
Maintain engineering excellence – Write clean, well-tested code; conduct thorough code reviews; champion best practices across the team
Stay current – Evaluate emerging agentic frameworks, patterns, and tools; prototype new approaches to solve real problems

Skills & Competencies:

Software Engineering (Core):

Strong fundamentals in system design, API design, and distributed systems
Clean code practices, SOLID principles, and testable architecture
Async programming, concurrency, and performance optimization, Caching
Database design (relational and vector stores)
CI/CD, observability, and production operations

Agentic Systems:

Agent architecture – orchestration, planning, tool use, memory management
LLM integration – prompt engineering, function calling, context management
RAG pipelines – embeddings, vector search, retrieval strategies
Reliability patterns for non-deterministic AI systems

ML:

Basic understanding of ML concepts – training, inference, evaluation, overfitting/underfitting
Familiarity with embeddings and how vector representations work
Experience fine-tuning or adapting pre-training models for specific use cases
Exposure to ML frameworks (PyTorch, Hugging Face Transformers, scikit-learn) at a foundational level
Understanding of model evaluation metrics (precision recall, F1, perplexity)
Awareness of when to use off-the-shelf models vs. custom training

Nice to Have:

Experience with agent orchestration frameworks (LangGraph, AutoGen, custom implementations)
Background in vector databases and semantic search
Familiarity with AI safety and guardrail patterns
Experience mentoring engineers or leading technical initiatives

Minimum Qualifications:

Bachelor’s Degree in computer science, engineering or related technical field
6+ years in professional software engineering experience
2+ years building applications that integrate LLMs or agentic systems
Proficiency in Python with experience in modern frameworks (FastAPI, async/await)
Experience with cloud platforms (AWS preferred – Lambda, Bedrock, OpenSearch)
Proven track record of shipping and operating production systems
Strong debugging, troubleshooting, and problem-solving skills
Excellent communication skills with an ability to work with global, cross-functional teams, and stakeholders

Fullsteam supports an inclusive workplace that values diversity of thought, experience, and background. Fullsteam is an Equal Opportunity/Affirmative Action employer. All qualified applicants will receive consideration for employment without regard to race, religion, color, national origin, ancestry, age, physical or mental disability, sex, sexual orientation, gender identity/expression, pregnancy, veteran status, marital status, creed, status with regard to public assistance, genetic status or any other status protected by federal, state, or local law.

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